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Location obfuscation is a technique used in location-based services or information systems to protect the location of the users by slightly altering, substituting or generalizing their location in order to avoid reflecting their real position. A formal definition of location obfuscation can be "the means of deliberately degrading the quality of information about an individual's location in order to protect that individual's location privacy.〔M. Duckham, L. Kulik and A. Birtley, "A Formal Model of Obfuscation and Negotiation for Location Privacy." In Proc. Pervasive 2005. LCNC 3468/2005, pp. 243–251, 2005〕 == Obfuscation techniques == The most common techniques to perform this change are: * Pseudonyms and the use of third party location providers〔T. Rodden, A. Friday, H. Muller, and A. Dix, "A Lightweight Approach to Managing Privacy in Location-Based Services". Technical Report. Equator-02-058. CSTR-07-006, University of Nottingham and Lancaster University and University of Bristol. October 2002.〕 * "Spatial cloaking" techniques in which a user is k-anonymous if her exact location cannot be distinguished among k-1 other users 〔M. Gruteser and D. Grunwald, "Anonymous usage of location-based services through spatial and temporal cloaking". In Proc. MobiSys ’03, pp. 31–42, 2003.〕 * "Invisible cloaking", in which no locations are provides for certain zones * Adding random noise to the position * Rounding, which uses landmarks to approximate the location 〔Krumm, J, “Inference Attacks on Location Tracks”. In Proc. Pervasive 2007, Springer-Verlag, pp. 127–143.〕 * Redefinition of possible areas of location. One example of the application of location obfuscation can be seen in the following figure. In this figure, a linear path is obfuscated by two versions of the random noise technique, in which a maximum random noise of 20 (red) and 40 (green) meters is added to the original path (blue), showing a very different trajectory and not revealing the real location of the user. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Location obfuscation」の詳細全文を読む スポンサード リンク
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